drm: Use horizontal and vertical chroma subsampling factor while calculating offsets in the physical address of framebuffer
For multi-planar formats, while calculating offsets in planes with index greater than 0 (ie second plane, third plane, etc), one needs to divide (src_x * cpp) with horizontal chroma subsampling factor and (src_y * pitch) with vertical chroma subsampling factor. The reason being that the planes contain subsampled (ie reduced) data (by a factor of 2) and thus while calculating the byte position coresponding to the x and y co-ordinates, one needs to divide it with the sampling factor. Signed-off-by: Ayan Kumar halder <ayan.halder@arm.com> Reviewed-by: Liviu Dudau <liviu.dudau@arm.com> Link: https://patchwork.kernel.org/patch/10569263/
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@ -86,14 +86,21 @@ dma_addr_t drm_fb_cma_get_gem_addr(struct drm_framebuffer *fb,
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{
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{
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struct drm_gem_cma_object *obj;
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struct drm_gem_cma_object *obj;
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dma_addr_t paddr;
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dma_addr_t paddr;
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u8 h_div = 1, v_div = 1;
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obj = drm_fb_cma_get_gem_obj(fb, plane);
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obj = drm_fb_cma_get_gem_obj(fb, plane);
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if (!obj)
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if (!obj)
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return 0;
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return 0;
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paddr = obj->paddr + fb->offsets[plane];
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paddr = obj->paddr + fb->offsets[plane];
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paddr += fb->format->cpp[plane] * (state->src_x >> 16);
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paddr += fb->pitches[plane] * (state->src_y >> 16);
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if (plane > 0) {
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h_div = fb->format->hsub;
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v_div = fb->format->vsub;
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}
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paddr += (fb->format->cpp[plane] * (state->src_x >> 16)) / h_div;
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paddr += (fb->pitches[plane] * (state->src_y >> 16)) / v_div;
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return paddr;
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return paddr;
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}
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}
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